666653408216 has 32 divisors (see below), whose sum is σ = 1304385348960. Its totient is φ = 318818725632.

The previous prime is 666653408209. The next prime is 666653408227. The reversal of 666653408216 is 612804356666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4294286 + ... + 4446818.

It is an arithmetic number, because the mean of its divisors is an integer number (40762042155).

Almost surely, 2^666653408216 is an apocalyptic number.

It is an amenable number.

666653408216 is a deficient number, since it is larger than the sum of its proper divisors (637731940744).

666653408216 is a wasteful number, since it uses less digits than its factorization.

666653408216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176315 (or 176311 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 53.

The spelling of 666653408216 in words is "six hundred sixty-six billion, six hundred fifty-three million, four hundred eight thousand, two hundred sixteen".